Photovoltaic incoming line protection device

Abstract

The utility model provides a photovoltaic incoming line protection device, comprising a DC input interface used for connecting an external photovoltaic power generation assembly so as to receive DC output by the photovoltaic power generation assembly; the direct-current output interface is used for connecting an energy storage converter, and the direct-current output interface is connected with the direct-current input interface through a connecting cable; the contactor is connected to the connecting cable and is used for connecting or disconnecting the corresponding direct current input interface and the direct current output interface; and the surge protector is arranged on a line segment between the contactor and the direct current output interface in the connecting cable. The photovoltaic incoming line protection device can disconnect the circuit between the photovoltaic power generation assembly and the energy storage converter when the current output by the photovoltaic power generation assembly is abnormal, thereby preventing the energy storage converter from being damaged, and enabling the energy storage converter to have better safety.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to a photovoltaic incoming line protection device. Background Art

[0002] With the enhancement of people's awareness of environmental protection, vigorously developing clean and renewable energy has become a global consensus. In this context, the energy storage system has achieved rapid development. In some energy storage systems, photovoltaic panels are used to convert solar energy into electrical energy, and then transmit it to the energy storage inverter in the form of direct current. The energy storage inverter can either convert direct current into alternating current to send electrical energy into the power grid or supply it to loads, or use direct current to charge the battery. Therefore, the energy storage inverter plays an important role in the energy storage system and is one of the core devices. It is necessary to ensure the safety of the energy storage inverter during use. Content of the Utility Model

[0003] An object of the utility model is to provide a photovoltaic incoming line protection device that can make the energy storage inverter have better safety.

[0004] Specifically, the utility model provides a photovoltaic incoming line protection device, including:

[0005] A direct current input interface for connecting an external photovoltaic power generation component to receive the direct current output by the photovoltaic power generation component;

[0006] A direct current output interface for connecting to the energy storage inverter, and the direct current output interface is connected to the direct current input interface through a connecting cable;

[0007] A contactor connected to the connecting cable and used to connect or disconnect the corresponding direct current input interface and the direct current output interface; and

[0008] A surge protector arranged on the line segment between the contactor and the direct current output interface in the connecting cable.

[0009] Optionally, the photovoltaic incoming line protection device further includes a fuse arranged on the line segment between the contactor and the surge protector in the connecting cable.

[0010] Optionally, the photovoltaic incoming line protection device further includes a housing, the direct current input interface and the direct current output interface are arranged on the surface of the housing, and the connecting cable, the contactor, the fuse and the surge protector are arranged inside the housing.

[0011] Optionally, the photovoltaic incoming line protection device further includes an external controller disposed outside the housing, and the external controller is configured to control the on / off state of the contactor, thereby controlling the on / off of the circuit between the DC input interface and the DC output interface.

[0012] Optionally, the photovoltaic incoming line protection device further includes an adapter having a first connector and a plurality of second connectors. The first connector is used to connect to the DC output interface, and the plurality of second connectors are used to connect to different types of energy storage converter interfaces.

[0013] Optionally, the first connector is provided with a wire storage cavity and a wire storage cover for opening and closing the wire storage cavity. One end of the connecting wire between the first connector and the second connector is connected in the wire storage cavity, and the other end is connected to the second connector, so that the wire storage cavity can accommodate the connecting wire between the first connector and the second connector.

[0014] Optionally, the housing is provided with a plurality of heat dissipation holes to release the heat inside the housing through the heat dissipation holes.

[0015] Optionally, the photovoltaic incoming line protection device further includes a control module configured to receive the magnitude of the current at the DC input interface and control the on / off of the contactor, and the control module is configured to control the contactor to disconnect when the current at the DC input interface is greater than or equal to the rated current of the contactor.

[0016] Optionally, the photovoltaic incoming line protection device further includes a monitoring module and a display screen. The monitoring module is configured to obtain the on / off state of the fuse, and the display screen is configured to display the status information of the photovoltaic incoming line protection device. The status information at least includes the current at the DC input interface and the on / off conditions of all the fuses.

[0017] Optionally, the photovoltaic incoming line protection device further includes a wireless communication module connected to the control module and the monitoring module, so as to transmit the status information to the cloud platform via the wireless communication module, send a control instruction to the control module via the wireless communication module, and control the on / off of the contactor via the control instruction.

[0018] The PV incoming line protection device of the present utility model is provided with a contactor and a surge protector. The contactor is arranged between the DC input interface and the DC output interface. By using the contactor to control the connection or disconnection of the circuit between the DC input interface and the DC output interface, the connection situation between the PV power generation components and the energy storage converter can be flexibly controlled. In this way, the PV incoming line protection device can disconnect the circuit between the PV power generation components and the energy storage converter when the current output by the PV power generation components is abnormal, avoiding damage to the energy storage converter and making the energy storage converter have better safety. Moreover, the surge protector can conduct the current into the ground when a surge current appears in the circuit, further ensuring the safety of the energy storage converter. In addition, since the surge protector is arranged at the rear end of the contactor and the connection or disconnection of the circuit between the DC input interface and the DC output interface can be flexibly controlled by the contactor, the replacement of the surge protector is more convenient, improving the convenience during the use of the PV incoming line protection device.

[0019] Furthermore, the PV incoming line protection device of the present utility model is provided with an external controller on the outer side of the housing. The external controller is used to control the on-off state of the contactor, and then control the on-off of the circuit between the DC input interface and the DC output interface. That is to say, by operating the external controller on the outer side of the housing, the on-off state of the contactor can be adjusted, making the PV incoming line protection device convenient to operate, durable, stable in performance, high in safety and widely applicable. Moreover, when replacing the fuse or the surge protector, the circuit can be disconnected by using the external controller, making the replacement process more convenient.

[0020] Based on the following detailed description of the specific embodiments of the present utility model in conjunction with the drawings, those skilled in the art will become more clear about the above and other objects, advantages and features of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Some specific embodiments of the present utility model will be described in detail hereinafter with reference to the drawings in an exemplary but non-limiting manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0022] Figure 1 is a schematic circuit diagram of a PV incoming line protection device according to an embodiment of the present utility model;

[0023] Figure 2 is a schematic diagram of a PV incoming line protection device according to an embodiment of the present utility model;

[0024] Figure 3 is a schematic diagram of an adapter in a PV incoming line protection device according to an embodiment of the present utility model;

[0025] Figure 4 It is a schematic block diagram of a photovoltaic incoming line protection device according to another embodiment of the present invention;

[0026] Figure 5 It is a schematic block diagram of an energy storage system according to an embodiment of the present invention. Detailed implementation manners

[0027] Those skilled in the art should understand that the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments of the present invention. This part of the embodiments is intended to explain the technical principle of the present invention, rather than to limit the protection scope of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts should still fall within the protection scope of the present invention.

[0028] Furthermore, it should be noted that in the description of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can also be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0029] As Figure 1 shown, in one embodiment, the photovoltaic incoming line protection device includes a DC input interface 10, a DC output interface 20, a contactor 30, and a surge protector 40. The DC input interface 10 is used to connect to an external photovoltaic power generation component to receive the direct current output by the photovoltaic power generation component. The DC output interface 20 is used to connect to an energy storage converter. The DC output interface 20 is connected to the DC input interface 10 through a connection cable. The contactor 30 is connected to the connection cable and is used to connect or disconnect the corresponding DC input interface 10 and DC output interface 20. The surge protector 40 is disposed on the line segment between the contactor 30 and the DC output interface 20 in the connection cable.

[0030] Referring to Figure 1As shown, specifically, the photovoltaic power generation component is a single photovoltaic panel or multiple series-connected photovoltaic panels. The photovoltaic power generation component converts solar energy into electrical energy and outputs direct current. The DC input interface 10 is connected to the photovoltaic power generation component to receive the direct current from the photovoltaic power generation component. That is to say, the DC input interface 10 has a positive interface and a negative interface. Similarly, the DC output interface 20 also has a positive interface and a negative interface. The DC input interface 10 and the DC output interface 20 are connected via a connecting cable, that is, the positive interface of the DC input interface 10 and the positive interface of the DC output interface 20 form an electrical connection, and the negative interface of the DC input interface 10 and the negative interface of the DC output interface 20 form an electrical connection.

[0031] Referring to Figure 1 As shown, the photovoltaic incoming line protection device of this embodiment is provided with two DC input interfaces 10 and two DC output interfaces 20, and the two DC input interfaces 10 and the two DC output interfaces 20 are connected in one-to-one correspondence.

[0032] It should be noted that in some other embodiments, the photovoltaic incoming line protection device can also be provided with one, three or more DC input interfaces and corresponding numbers of DC output interfaces.

[0033] Continuing to refer to Figure 1 As shown, the contactor 30 is connected to the connecting cable between the DC input interface 10 and the DC output interface 20, so that it can be used to connect or disconnect the circuit between the DC input interface 10 and the DC output interface 20. Specifically, the contactor 30 is a four-wire DC contactor, that is, it has two sets of contacts, and each set of contacts has a positive contact and a negative contact. The positive contact of one set of contacts is connected between the positive interface of one set of DC input interfaces 10 and the positive interface of the DC output interface 20, and the negative contact is connected between the negative interface of one set of DC input interfaces 10 and the negative interface of the DC output interface 20. The positive contact of the other set of contacts is connected between the positive interface of the other set of DC input interfaces 10 and the positive interface of the DC output interface 20, and the negative contact is connected between the negative interface of the other set of DC input interfaces 10 and the negative interface of the DC output interface 20.

[0034] Referring to Figure 1 As shown, the photovoltaic incoming line protection device includes two surge protectors 40. Each surge protector 40 corresponds to a set of DC input interfaces 10 and DC output interfaces 20. The positive pole of the surge protector 40 is connected to the positive line between the contactor 30 and the DC output interface 20, and the negative pole of the surge protector 40 is connected to the negative line between the contactor 30 and the DC output interface 20.

[0035] It should be noted that according to the different numbers of DC input interfaces and DC output interfaces, the number of contacts of the contactor and the number of surge protectors can be adaptively changed.

[0036] In the solution of this embodiment, by setting a contactor 30 and a surge protector 40 in the photovoltaic incoming line protection device, the contactor 30 is arranged between the DC input interface 10 and the DC output interface 20, and the contactor 30 is used to control the connection or disconnection of the circuit between the DC input interface 10 and the DC output interface 20. Thus, the connection between the photovoltaic power generation component and the energy storage converter can be flexibly controlled by the contactor 30, enabling the photovoltaic incoming line protection device to disconnect the circuit between the photovoltaic power generation component and the energy storage converter when the current output by the photovoltaic power generation component is abnormal, avoiding damage to the energy storage converter and ensuring better safety for the energy storage converter. Moreover, the surge protector 40 can conduct the current into the ground when a surge current appears in the circuit, further ensuring the safety of the energy storage converter.

[0037] In addition, since the surge protector 40 is arranged at the rear end of the contactor 30, and the contactor 30 can flexibly control the on-off of the circuit between the DC input interface 10 and the DC output interface 20, the replacement of the surge protector 40 is relatively convenient, improving the convenience during the use of the photovoltaic incoming line protection device.

[0038] As Figure 1 shown, the photovoltaic incoming line protection device further includes a fuse 50, which is arranged on the line segment between the contactor 30 and the surge protector 40 in the connecting cable. Specifically, a fuse 50 is provided on both the positive line and the negative line between the contactor 30 and the surge protector 40.

[0039] Taking the connection between one group of the DC input interface 10 and the DC output interface 20 as an example, the positive interface of the DC input interface 10 is connected to the positive contact of the contactor 30, the positive contact of the contactor 30 is then connected to the fuse 50, the fuse 50 is then connected to the positive pole of the surge protector 50, and is connected to the positive interface of the DC output interface 20. The negative interface of the DC input interface 10 is connected to the negative contact of the contactor 30, the negative contact of the contactor 30 is then connected to the fuse 50, the fuse 50 is then connected to the negative pole of the surge protector 50, and is connected to the negative interface of the DC output interface 20.

[0040] Those skilled in the art can understand that by setting the fuse 50 on the line between the contactor 30 and the surge protector 40, the fuse 50 can disconnect the connection between the DC input interface 10 and the DC output interface 20 when the current is large, and can also play a role in protecting the energy storage converter. The photovoltaic incoming line protection device composed of the contactor 30, the surge protector 40, and the fuse 50 achieves a good protection effect on the basis of a relatively low cost, can better avoid the generation of electric arcs, and will not occur the situation of losing the action selectivity.

[0041] As Figure 1and Figure 2 As shown, in one embodiment, the photovoltaic incoming line protection device further includes a housing 100. The DC input interface 10 and the DC output interface 20 are disposed on the surface of the housing 100, and the connection cable, the contactor 30, the surge protector 40, and the fuse 50 are disposed inside the housing 100.

[0042] Referring to Figure 1 and Figure 2 As shown, specifically, the DC input interface 10 and the DC output interface 20 are disposed on the surface of the housing 100, that is, the DC input interface 10 and the DC output interface 20 can be observed from the outside, so that the photovoltaic incoming line protection device is connected to the photovoltaic power generation module and the energy storage converter on the outside of the housing 100. At the same time, the contactor 30, the surge protector 40, and the fuse 50 are disposed in the internal space of the housing 100, and the connection cable is used to connect the DC input interface 10 and the DC output interface 20 inside the housing 100.

[0043] Those skilled in the art can understand that by disposing the DC input interface 10 and the DC output interface 20 on the surface of the housing 100, and disposing the connection cable, the contactor 30, the surge protector 40, and the fuse 50 inside the housing 100, the photovoltaic incoming line protection device forms an integral modular device, making the replacement and use of the photovoltaic incoming line protection device more convenient. At the same time, the housing 100 can also provide good protection and waterproof and dustproof functions for the internal devices.

[0044] Referring to Figure 1 and Figure 2 As shown, the photovoltaic incoming line protection device further includes a peripheral controller 200. The peripheral controller 200 is disposed outside the housing 100, and the peripheral controller 200 is used to control the on / off state of the contactor 30, and then control the on / off of the circuit between the DC input interface 10 and the DC output interface 20. Specifically, the peripheral controller 200 is a knob-type controller. That is to say, by turning the knob-type controller outside the housing 100, the on / off state of the contactor 30 can be adjusted, making the photovoltaic incoming line protection device easy to operate, durable, stable in performance, high in safety and widely applicable. Moreover, when replacing the fuse or the surge protector, the circuit can be disconnected by using the peripheral controller 200, making the replacement process more convenient.

[0045] Those skilled in the art can understand that by providing a peripheral controller 200 on the outer side of the housing 100, the peripheral controller 200 is used to control the on / off state of the contactor 30, and then control the on / off of the circuit between the DC input interface 10 and the DC output interface 20. That is to say, by operating the peripheral controller 200 on the outer side of the housing 100, the on / off state of the contactor 30 can be adjusted, making the photovoltaic incoming line protection device convenient to operate, durable, stable in performance, high in safety and widely applicable. Moreover, when replacing the fuse or the surge protector, the circuit can be disconnected by using the peripheral controller 200, making the replacement process more convenient.

[0046] Referring to Figure 1 As shown, in one embodiment, the rated current of the contactor 30 is less than the rated current of the fuse 50, so that the situation where the fuse 50 needs to blow to protect the circuit equipment can be reduced, and the service life of the fuse 50 can be extended.

[0047] As Figure 2 shown, the housing 100 is provided with a plurality of heat dissipation holes 101 to release the heat inside the housing 100 through the heat dissipation holes 101. By providing the heat dissipation holes 101, it helps the components inside the housing 100 to dissipate heat and improves the service life of each component.

[0048] As Figure 2 shown, in one embodiment, the housing 100 is composed of two parts, including a housing body and a housing cover. The housing body forms a space with an open top, and the connecting cable, the contactor 30, the surge protector 40 and the fuse 50 are arranged in the space formed by the housing body. The housing cover covers the open top of the housing body. In this way, when overhauling or replacing components of the photovoltaic incoming line protection device, only the housing cover needs to be opened, making the work of overhauling and replacing components more convenient.

[0049] As Figure 1 and Figure 3 shown, in one embodiment, the photovoltaic incoming line protection device further includes an adapter 300, which has a first connector 310 and a plurality of second connectors 320. The first connector 310 is used to connect to the DC output interface 20. The plurality of second connectors 320 are used to connect to different types of energy storage converter interfaces. That is to say, the DC output interface 20 of the photovoltaic incoming line protection device can be connected to energy storage converters with different interface types via the adapter 300.

[0050] In the solution of this embodiment, by providing an adapter 300 with a first connector 310 and a plurality of second connectors 320, the DC output interface 20 is connected to the adapter 300 via the first connector 310, so that the PV incoming line protection device can select a suitable second connector 320 for connection according to the interface type of the energy storage converter to be connected. This helps to improve the flexibility of the PV incoming line protection device, expand the application range of the PV incoming line protection device, and make the PV incoming line protection device more versatile.

[0051] Referring Figure 3 As shown, further, the first connector 310 is provided with a wire storage cavity 301 and a wire storage cover 311 for opening and closing the wire storage cavity 301. One end of the connecting wire between the first connector 310 and the second connector 320 is connected inside the wire storage cavity 301, and the other end is connected to the second connector 320, so that the wire storage cavity 301 can accommodate the connecting wire between the first connector 310 and the second connector 320. Moreover, the wire storage cover 311 has an avoidance area, so that when the wire storage cover 311 closes the wire storage cavity 301, the avoidance area is used for the connecting wire between the first connector 310 and the second connector 320 to pass through. Specifically, the wire storage cover 311 is a split-type cover body. Or, in some other embodiments, it can also be a single-side opening type cover body.

[0052] By providing the wire storage cavity 301 and the wire storage cover 311 on the first connector 310, the connecting wire between the first connector 310 and the second connector 320 can be set to be relatively long. When the PV incoming line protection device is far from the energy storage converter, connection can also be achieved. When the PV incoming line protection device is close to the energy storage converter, the excess connecting wire can be stored in the wire storage cavity 301, and then the wire storage cover 311 is closed to fixedly store the excess connecting wire. In this way, the PV incoming line protection device can be installed with the energy storage converter at various distances, improving the flexibility of use of the PV incoming line protection device and avoiding the inconvenience caused by the excessive mess of the too long connecting wire.

[0053] Combined Figure 1 and Figure 4 As shown, in one embodiment, the PV incoming line protection device 1 includes a control module 400. The control module 400 is used to receive the magnitude of the current at the DC input interface 10 and control the on-off of the contactor 30, and the control module 400 is configured to control the contactor 30 to disconnect when the current at the DC input interface 10 is greater than or equal to the rated current of the contactor 30. Specifically, a current sensor can be provided at the DC input interface 10, and the control module 400 obtains the magnitude of the current at the DC input interface 10 through the current sensor.

[0054] In the solution of this embodiment, by setting the control module 400, the control module 400 is used to receive the magnitude of the current at the DC input interface 10 and control the on / off of the contactor 30, and the control module 400 is configured to control the contactor 30 to disconnect when the current at the DC input interface 10 is greater than or equal to the rated current of the contactor 30. That is to say, the on / off of the contactor 30 can be controlled by the magnitude of the current at a position more upstream of the contactor 30, so that the contactor 30 can be disconnected more timely when the current is abnormal, providing a better protection effect for the circuit.

[0055] Combined with Figure 1 and Figure 4 As shown, in one embodiment, the PV incoming line protection device 1 includes a monitoring module 500 and a display screen 600. The monitoring module 500 is used to obtain the on / off state of the fuse 50. The display screen 600 is used to display the state information of the PV incoming line protection device 1, and the state information at least includes the current at the DC input interface 10 and the on / off conditions of all fuses 50.

[0056] Specifically, it can be detected whether the fuse 50 is blown by detecting parameters such as current, voltage, and temperature. The monitoring module 500 obtains the state of the fuse 50 in real time, the control module 400 obtains the current at the DC input interface 10, and displays the state of the fuse 50 and the current at the DC input interface 10 on the display screen 600.

[0057] In the solution of this embodiment, by setting the monitoring module 500 and the display screen 600 in the PV incoming line protection device 1, the monitoring module 500 is used to obtain the on / off state of the fuse 50, and the display screen 600 is used to display the current at the DC input interface 10 and the on / off conditions of all fuses 50, so that the state information of the PV incoming line protection device 1 can be intuitively displayed to the outside world, which helps to obtain the relevant information of the PV incoming line protection device 1 more conveniently.

[0058] Combined with Figure 1 and Figure 4 As shown, the PV incoming line protection device 1 includes a wireless communication module 700. The wireless communication module 700 is connected to the control module 400 and the wireless communication module 700 is connected to the monitoring module 500. To transmit the state information to the cloud platform via the wireless communication module 700, send a control instruction to the control module 400 via the wireless communication module 700, and control the on / off of the contactor 30 via the control instruction.

[0059] Specifically, the wireless communication module 700 can receive the current information at the DC input interface 10 obtained by the control module 400, the on / off state of the fuse 50 obtained by the monitoring module 500, and other configurable status information of the PV incoming line protection device 1, so as to send the status information of the PV incoming line protection device 1 to the cloud platform, enabling the user to obtain the status information of the PV incoming line protection device 1 more timely, and thus performing timely maintenance on the PV incoming line protection device 1.

[0060] In addition, the wireless communication module 700 can also remotely receive control instructions from the user, enabling the control module 400 to receive the control instructions, and thereby controlling the on / off of the contactor 30 via the control instructions, that is, enabling the user to remotely control the on / off of the contactor 30, and thus remotely controlling the on / off of the circuit between the DC input interface 10 and the DC output interface 20. Furthermore, it is possible to manually remotely control the disconnection of the circuit under special circumstances to better protect the circuit.

[0061] As Figure 5 shown, in one embodiment, the energy storage system includes a PV incoming line protection device 1, a PV power generation component 2, and an energy storage converter 3. The PV incoming line protection device 1 connects the PV power generation component 2 and the energy storage converter 3, enabling the PV power generation component 2 to deliver current to the energy storage converter 3 via the PV incoming line protection device 1.

[0062] At this point, those skilled in the art should recognize that although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and determined to cover all these other variations or modifications.

Claims

1. A photovoltaic incoming line protection device, characterized in that, Comprising: A DC input interface for connecting to an external photovoltaic power generation component to receive the direct current output by the photovoltaic power generation component; A DC output interface for connecting to an energy storage converter, and the DC output interface is connected to the DC input interface through a connecting cable; A contactor connected to the connecting cable and used to connect or disconnect the corresponding DC input interface and the DC output interface; And A surge protector disposed on the line segment between the contactor and the DC output interface in the connecting cable.

2. The photovoltaic incoming line protection device according to claim 1, wherein The photovoltaic incoming line protection device further includes a fuse disposed on the line segment between the contactor and the surge protector in the connecting cable.

3. The photovoltaic incoming line protection device according to claim 2, wherein The photovoltaic incoming line protection device further includes a housing, the DC input interface and the DC output interface are disposed on the surface of the housing, and the connecting cable, the contactor, the fuse and the surge protector are disposed inside the housing.

4. The photovoltaic incoming line protection device according to claim 3, wherein The photovoltaic incoming line protection device further includes an external controller disposed outside the housing, and the external controller is used to control the on / off state of the contactor, and then control the on / off of the circuit between the DC input interface and the DC output interface.

5. The photovoltaic incoming line protection device according to claim 3, wherein The photovoltaic incoming line protection device further includes an adapter having a first connector and a plurality of second connectors, the first connector is used to connect to the DC output interface, and the plurality of second connectors are used to connect to different types of energy storage converter interfaces.

6. The photovoltaic incoming line protection device according to claim 5, wherein The first connector is provided with a wire storage cavity and a wire storage cover for opening and closing the wire storage cavity, and one end of the connecting wire between the first connector and the second connector is connected to the wire storage cavity, and the other end is connected to the second connector, so that the wire storage cavity can accommodate the connecting wire between the first connector and the second connector.

7. The photovoltaic incoming line protection device according to claim 3, wherein The housing is provided with a plurality of heat dissipation holes to release the heat inside the housing through the heat dissipation holes.

8. The photovoltaic incoming line protection device according to claim 2, wherein The photovoltaic incoming line protection device further includes a control module for receiving the magnitude of the current at the DC input interface and controlling the on / off of the contactor, and the control module is configured to control the contactor to disconnect when the current at the DC input interface is greater than or equal to the rated current of the contactor.

9. The photovoltaic incoming line protection device according to claim 8, wherein The photovoltaic incoming line protection device further includes a monitoring module and a display screen. The monitoring module is used to obtain the on-off state of the fuse, and the display screen is used to display the status information of the photovoltaic incoming line protection device. The status information at least includes the current at the DC input interface and the on-off conditions of all the fuses.

10. The photovoltaic incoming line protection device according to claim 9, wherein the photovoltaic incoming line protection device further includes a wireless communication module. The wireless communication module is connected to the control module and is also connected to the monitoring module, so as to transmit the status information to the cloud platform via the wireless communication module, send a control instruction to the control module via the wireless communication module, and control the on-off of the contactor via the control instruction.

Images